I have the same problem mine was alive until i turned on the fan to scare him out. Bad thing was he was right next to the fan wheel when i did and i sprayed him all in the box. There is a duct that attaches to the box under the dash that you can unbolt and pull back to see in there. That is how i found my little guys nest. Depending on where he is you might have to go past the mixer flap thing. Good luck i know the smell is horrible after a summer with him rotting in your vents.
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